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volcanic rock |
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volcanic rock [väl′kan·ik ′räk] (geology) Finely crystalline or glassy igneous rock resulting from volcanic activity at or near the surface of the earth. Also known as extrusive rock. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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However, most Archean volcanic rocks occur as deformed and fault-fragmented packages termed greenstone belts. He and his colleagues analyzed more than 200 volcanic rocks and pieces of debris, such as roof tiles, from Pompeii. Researchers reached this conclusion after studying volcanic rocks from South Africa. |
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